20320140321 has 12 divisors (see below), whose sum is σ = 31609107348. Its totient is φ = 12504701664.

The previous prime is 20320140319. The next prime is 20320140331. The reversal of 20320140321 is 12304102302.

20320140321 is a `hidden beast` number, since 20 + 320 + 1 + 4 + 0 + 321 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3201296400 + 17118843921 = 56580^2 + 130839^2 .

It is not a de Polignac number, because 20320140321 - 2¹ = 20320140319 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20320140294 and 20320140303.

It is not an unprimeable number, because it can be changed into a prime (20320140331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86838090 + ... + 86838323.

It is an arithmetic number, because the mean of its divisors is an integer number (2634092279).

Almost surely, 2^20320140321 is an apocalyptic number.

It is an amenable number.

20320140321 is a deficient number, since it is larger than the sum of its proper divisors (11288967027).

20320140321 is a wasteful number, since it uses less digits than its factorization.

20320140321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173676432 (or 173676429 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20320140321 its reverse (12304102302), we get a palindrome (32624242623).

The spelling of 20320140321 in words is "twenty billion, three hundred twenty million, one hundred forty thousand, three hundred twenty-one".